Add offset playback coverage for play media tool

[Teagan42]

What

• extend the play media test to cover a non-zero offset
• verify the fake Plex client receives the expected millisecond offset and the tool response echoes the seconds value

Why

• ensure the play media tool forwards offsets correctly and returns the requested offset to callers

Affects

• tests

Testing

• uv run pytest tests/test_server.py::test_play_media_with_alias

Documentation

• not needed

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https://chatgpt.com/codex/tasks/task_e_68e489b9f2888328b3c649f577f4363b

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mcp_plex/loader
__init__.py	386	18	95%	80–87, 161, 251–256, 633, 748–750, 752, 838–857, 1222
mcp_plex/loader/pipeline
__init__.py	16	7	56%	57–62, 68
enrichment.py	440	60	86%	245, 250, 281, 283, 290, 294, 398, 419, 439, 447–449, 456–459, 462–464, 472, 535, 591, 616, 620, 622, 652, 670, 682, 711, 717, 720–728, 754, 757–759, 776–778, 798–801, 805, 819–825, 847, 849, 852–854
ingestion.py	155	13	92%	80, 129–149, 187, 224, 240, 333, 339, 359
orchestrator.py	92	5	95%	48, 126, 155, 178–179
persistence.py	129	9	93%	113, 155–156, 166, 177, 181–183, 236
mcp_plex/server
__init__.py	645	31	95%	52–53, 133–134, 162, 231, 237–238, 304, 325–328, 345, 410, 413, 450, 468–469, 506, 1157, 1179–1185, 1221, 1239, 1244, 1262, 1386, 1423
__main__.py	4	4	0%	3–8
config.py	48	7	85%	50, 52–55, 65, 76
TOTAL	2210	154	93%

Tests	Skipped	Failures	Errors	Time
143	0 💤	0 ❌	0 🔥	1m 8s ⏱️